Ballistic Silence of Special Years

For the first shot, Li Zheng felt that the recoil was a little stronger than before, but he was overjoyed.

You must know that there are many factors that affect recoil, such as charge, gun cushion design, and even the gun's air guidance mode.

If a gun suddenly increases its recoil without changing any structure, it can only be said that the charge is stronger.

It's just that the space in the bullet that can be filled with charge is limited, that is to say, unless there is a change in the design of the warhead that causes a change in the charge space, it is impossible to charge more.

Another point is the composition of the propellant, which is also a high-end job that is very technical, and it is not something ordinary people can handle.

The increased recoil means that the increased power of the bullet is not all advantages. If the control is not good, it will also affect the shooting accuracy. For example, Li Zheng felt that the recoil of the first shot was slightly increased compared with the previous ammunition. It depends on the individual shooter to adapt, otherwise the only option is to change the gun, which is not a trivial matter. It will be a huge project to improve the guns issued on a large scale, and the military industry department will scold them.

This is the key point of contradiction, and it is also the place where trade-offs need to be made.

However, ordinary snipers may be very sensitive to recoil, but as a group of top snipers in the army, they will know the difference between the gun and the bullet after one shot, and then they will make corresponding adjustments.

Standing behind the snipers, the old man looked at the targets on the laptop and looked back to the No. 5 instructor and Zhuang Yan with some disappointment, "This first shot is not so good compared to their usual accuracy. .”

The implication is that it is not as good as the results they recorded before.

Sniper rifle bullets that require extremely long-range and precise shooting are relatively slender, precision-made, and expensive to manufacture.

No. 5 said: "Old man, do you think you are the first batch of people to use this kind of ammunition? I just got the advice of the chief, so I came here to recommend this kind of ammunition to you. If the effect is good, we will be the first to install it in the future. The cost of special forces for large-scale production will be lower, which is better than hiding and using in a small area.”

Zhuang Yan and instructor No. 5 smiled at each other.

It was actually better than the first group's 600-meter results, and the distribution points were all within 0.3MOA.

The shape of the bullet is often narrowed at the tail, in order to delay the separation of the boundary layer as much as possible, and some bottoms are also designed to be concave to reduce pressure differential resistance.

Moreover, more costs must be paid for shape processing.

The jujube-shaped warhead is the so-called symmetrical warhead. As the name suggests, it looks like a jujube stone, with two pointed ends and a thick middle.

Therefore, this is only a more excellent warhead in theory, but it is difficult to achieve in reality.

However, the jujube-core warhead design is real.It's just that the two ends are not completely symmetrical, and the head is pointed.For example, a special Viking warhead for a sniper rifle produced by the American cheytac company is made of copper-nickel alloy, which has very high precision.

The results came out astonishing.

He believes that theoretically speaking, a slender and streamlined bullet can reduce air resistance and increase range and shooting accuracy, but it must be understood that the destructive power of bullets is not only penetrating power, but also cavity effect.

"Listening to the gunshots, the charge seems to be more violent."

The reduction of the propellant will reduce the pressure of the propellant gas during launch, and the chamber pressure will decrease, resulting in a decrease in the initial velocity of the warhead.

He asked Zhuang Yan, "Have you ever moved the warhead?"

The reason why its aerodynamic performance is so excellent, far surpassing that of ordinary warheads, is due to its almost date-shaped warhead design.

The larger the space occupied by the tail vortex, the greater the pressure differential resistance.If the bullet is completely made into a jujube core shape with two symmetrical ends, then this part of resistance can indeed be greatly reduced.

At the same time, it is also a question of the new ammunition.

And the jujube-type warhead is not without its drawbacks.Because the two ends are pointed, there will also be a large point installed in the cartridge case, which will inevitably occupy the volume in the cartridge case, which also means that the charge of the propellant in the cartridge case will be reduced.

This time the distance was increased to 800 meters.

The boat-shaped warhead has stable ballistics, high storage speed, and higher accuracy than traditional warheads, which are its advantages.

Lao Pan's heart fluttered, he picked up a bullet and looked at it again and again, the more he looked at it, the more he felt that there was something tricky in it.

It is not an easy task to make a bullet with high power and good trajectory without changing the gun.

But it is difficult for anything to be absolutely perfect. This kind of warhead also has its disadvantages, that is, the cost is extremely high and the manufacturing process is extremely demanding.

The old man looked at Zhuang Yan, then at instructor No. 5, seemed to understand something, and said with a smile: "Oh, then there is no problem."

So there is no need for long-range shooting bullets. For example, the bullets of a shotgun are steel balls, spherical, with low precision and low manufacturing cost. The charge does not need to be large, and the barrel does not need to be very long. The lethality is astonishing, and it often hits the soul with one shot, and the cavity effect is excellent.

The pressure difference resistance is caused by the pressure difference in the air at the tail of the bullet head. The reason for the pressure difference is that the tail of the bullet is separated from the boundary layer, and many vortices appear. These vortices reduce the air pressure, resulting in differential pressure resistance.

The penetration is excellent, but the cavity effect is relatively poor. It is necessary to greatly increase the charge and lengthen the barrel to increase the initial velocity of the bullet and increase the lethality.

Such a structure not only cannot increase the range of the bullet, but will decrease it. Because of this, several Viking ammunition so far are still experimental ammunition and have not been used in the military on a large scale.

这种弹头的性能极其优异，比如.375 Viking弹头重408GR.子弹初动能10479焦耳，2000米有着663米/秒的速度.超音速范围达到4.2千米。
.
408 Viking弹头重510GR。子弹动能13737焦耳。2000米有着773米/秒的速度。超音速范围达到5.5千米。

If the bullet weight was to remain the same, the caliber would have to be reduced and the entire firearm would have to be redesigned.

The famous Devil’s [-] cover is an example. The bullet head has been perfectly designed and manufactured accurately, and the range is long and accurate. However, when it hits the human body, it basically only pierces a small hole, and the bullet cannot form a larger The cavity effect, the stopping effect in the body is poor, so the lethality is reduced instead.

As a special sniper bomb, the manufacturing precision is high, and the output is relatively small, so the cost will be relatively high.

If the bullet is designed to be perfectly slender and streamlined, on the one hand, it will increase the production cost of the bullet, and on the other hand, it will reduce the cavity effect when the bullet hits.

Theoretically speaking, the closer to the streamlined shape, the less separation of the boundary layer and the smaller the pressure differential resistance.

The old man looked at the bullet holes on the target paper, his pupils were full of excitement, he couldn't help but said to instructor No. 5: "I think it's ok, now we practice in the morning every day and play the knockout round in the afternoon, but... "

Sure enough, as an expert, the old man's eyes lit up when he heard the jujube-shaped warhead, but he also put forward his own views.

The consequence of the compromise is that the aerodynamic performance will be somewhat lost, but the advantage is that the manufacturing precision requirements can be reduced, and the cost will also be reduced.

This is already very good data.

After the gun inspection, the results came out.

No. 5 said: "I think it will be better to play another group. The spread of the last four shots is very good, which is better than the original ammunition. I think this bullet has improved and can be used in the training team. If the effect is stable, all the ammunition here He is a veteran, so he will adapt quickly, and after seven days, he has already learned through it, and it will not affect the final competition and international competition."

The tail of this bullet is streamlined to reduce the impact of the vortex in the tail.As I said before, when a ship sails in water, eddy currents will also be generated, so the stern of the ship is made into a streamlined shape with a certain taper. This is the principle of the stern-shaped bullet. Outdated, to reduce the occurrence of severe air backflow, it does not mean that the tail vacuum area will not be formed, no matter what shape the bullet will form an air backflow vacuum area, it is only because of a tapered buffer of the stern-shaped bullet tail that the air backflow is not so violent, The formed vacuum zone is not so serious, so the eddy current resistance generated will be relatively much smaller.

If you want to use it as a normal ammo, you still have to go back to the conventional ship tail shape, which is also the meaning of "compromise" in the solemn mouth, and it is also the source of inspiration for the design of this new ammo.

Instructor No. 5 asked the old paralyzed man, "Would you like to move?"

An optimization method currently used by most military industrial units is to narrow the tail of the bullet, make the bullet into a boat shape, and some will also set a groove at the bottom. The bottom of the bullet reduces the pressure difference between the head and the tail.

He looked back at Majestic and No. 5 with some worry, and expressed his worry: "It's just that the amount of ammunition we used in this training camp plus competition is amazing. Do you know how many bullets I have prepared? Just this training team has been training since the training camp. , Elimination to the final competition, the current planned ammunition has reached 30 rounds, if your new ammunition is to be used in this competition and international competitions, you must at least have this guaranteed number, there are so many?"

Because when the bullet just flies away from the muzzle, the gunpowder gas ejected from the muzzle blows on the tail of the bullet. If the shape of the tail of the bullet is slightly asymmetrical, there will be obvious nutation, which will easily affect the shooting accuracy.

There is a functional relationship here, the more streamlined and precise the bullet, the higher the shooting accuracy and the farther the shooting distance, but the lower the stopping power and the worse the lethality.

So in reality there are compromises.

Zhuang Yan nodded and said: "Well, this is a ship-shaped warhead that is closer to the jujube-core warhead. I have made some design improvements and made some compromises on the arc of the tail, which is conducive to ballistic stability and does not cause damage. Excessive, the effect depends on their actual use effect, I tried it myself, it feels good and has improved, but the requirements for the shooter are higher. I didn’t get the ammunition, it’s Lao Hu’s secret recipe.”

The second set of ammunition was quickly distributed.

Because the resistance of the bullet moving in the air is composed of friction resistance and pressure difference resistance.

The more irregular and rough the shape of the bullet, the lower the shooting accuracy and the shorter the shooting distance, but the higher the stopping power, the greater the lethality. Of course, this is under the premise of the same weight of the bullet.

Increasing the weight of the projectile will cause the muzzle velocity to decrease, and the ballistic performance will deteriorate, which is not worth the candle.

While several people were talking, Li Zheng and the others had finished firing 5 rounds of ammunition.

The so-called boat-shaped warhead is currently the most mainstream warhead shape in the world, and many famous guns and high-precision spies use the boat-shaped warhead design.

Zhuang Yan, Lao Pan, and No. 5 looked at the targets one by one, and found that the impact points of the first shot and the remaining four shots were quite different.

The reason is that it is close to the tail of the jujube-shaped warhead. Such a tail is conducive to obtaining very good aerodynamic performance, but it is very sensitive to muzzle nutation.

But doing so will cause a problem, that is, if the bullet is made into a jujube-shaped or drop-shaped bullet while the caliber remains the same, the length of the bullet is equivalent to an increase, so the volume of the bullet is not equivalent to an increase.

The old man was unambiguous: "What's wrong? I want my team members to see if I am worthy to be their instructor?"

He said bluntly: "Okay, since I want to try, you two can also accompany Lu to fight together. We haven't compared each other for a long time. It's been so many years. We haven't met in 13 years since the last time we played against each other." .”

Zhuang Yan and Instructor No. 5 smiled at each other and nodded.

"Well, since the opportunity is rare, let's try it out and see if the level has dropped."

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